Illinois State Geological Survey guidebook series, vol. 30
"Geological field trip 5, April 24-25, 1999. North-Central section, Geological Society of America 33rd annual meeting, Champaign-Urbana, Illinois, April 22-23, 1999."
Includes bibliographical references (p. 32-34)
Harrison, Richard W; Hoffman, David; Illinois State Geological Survey; University of Illinois at Urbana-Champaign. Dept. of Geology; Geological Survey (U.S.). Water Resources Division; Geological Society of America. North-Central Section. Meeting. (33rd : 1999 : Champaign, Ill., and Urbana, Ill.)
Canon EOS 5D Mark II
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